Fillet Tool Not Working (Working in SolidWorks)

shawnrw

Hello,

Hoping someone here can help me out!

I'm trying to add a .125 radius to the groove, but Onshape doesn't seem able to achieve this with the fillet command. I'm able to achieve this with the basic fillet tool inside Solidworks, so I assume Onshape should be able to do it as well. I've added the same part from Solidworks with the fillets added for reference in the part linked below.


https://longbowcs.onshape.com/documents/b40fbe7531afca9978bc043c/w/2bdd68173e63cb5413f9cafb/e/8473ae2c95d679e9a15e598f?renderMode=0&uiState=664e5ae42511002b640d79d6


Thanks,
Shawn

S1mon

You shared via link only, so I can't copy the document to try to edit it.

I would guess that the issue is the almost spherical end.

Here are some things I would try:

1. Try a smaller radius, and sneak up on the value. This may give you some clues where things are failing
2. Turn off tangent propagation and fillet parts of it to see what works
3. Use the curvature analysis tools to examine the quality of the faces and edges - there may be some crappy results from the wrap feature which are making this challenging
4. Manually build the end (or whatever bit is failing)

Does the part need to be identical, or just functionally the same? What tolerances do you have to play with? Can you cheat by tweaking the size of anything?

shawnrw

I need the part to be the same. I've tried adjusting all the settings but cannot get any fillets to work. It's just odd to me that it works without issues on Solidworks. Hoping there was something easy I was doing wrong...

Sorry for the no-public; I can't find the public share option on Onshape Enterprise.

S1mon

In the long groove the fillet touches itself and at the end it’s broken into four faces. Those are all tricky. 

shawnrw

I can get it close, but I can't make this fillet any larger... I have to produce the circled fillet first and then the rest will work.

shawnrw

I am able to fillet this section easily in Solidworks. Any ideas? Onshape will not allow this fillet to go any larger than .04?

S1mon

I suspect that the small face is causing issues. Any tiny error in that surface will cause challenges for the filleting engine. In this case it looks like the curvature is accelerating in an extreme way. Fillet will need to extend this surface to create the information it needs to create the fillets. Again, without the model it's very hard to diagnose, but I would try using the two longer edges of this surface, creating a boundary surface, and replace the face. That might make it behave better.

shawnrw

Hopefully, this will help someone else in the future, but I was able to get the fillet to work by using a move face command. I.e. - move the face forward to achieve the fillet and then move it back and add the second fillet.